Blade-stropping device.



W. E. NICKERSON. BLADE STROF'PHIG DEVICE. MPI.I(IA.TIUH FILED 06125, 1927.

f. y 238 3, Fawn-ed Nan; 1918.

rennin oiirron.

WILLIAM E. NICKEBSGN, 0F CAMBRIDGE, MASSACHUSETTS, ASSIGNOR TO GILLETTE SAFETY RAZOR CQMPANY, 8F IBQSTON, MASSACHUSETTS, 1A CORPORATION OF DELA- WARE.

BLADE-STROPPING DEVICE.

Patented Nov. 5, 1918.

Original application filed January 26, 191$..Serial 1Y0. 74.394. Divided and this application filed October To (127210507X), it may concern:

Be it known that I. lViLLIAM E. NIUKER- sex, citizen of the United States, residing at Cambridge, in the county or" llliddlesex and State of Massachusetts, have invented certain new and useful improvements in Blade-Stropping Devices. of which the following is a specification.

My invention relates to sharpeni n devices in which the abrasive surface is provided by a detachable strip of leather or other flexible material, and has for its object the provision of simple and eil'ertive means whereby the flexible strip may be readily attached to or detached from the part which carries it and maintained under tension while in use. The particular embodiment of -niy invention herein described is a rotary stroppiug' device which is designed for use in a blade-simppin machine of the character set forth in my co-pending application, Serial No. H.394, filed January 2% 1916. of which the present application is a division.

ln the aecompnuyin; drawings ingr my invention:

Figure l is a end view oi the bladestrop ping device above referred to as preterably construct-ed.

Fig. 2 shows the device in transverse sec tion; and

Fig. 3 a longitudinal section on the line .r m in Fig. l.

in the rotary stropping device illustrated the body portion which serves as the carrier for the flexible strip eons illustrat- .1 of a frame having substantially the form of :1 segment :1 cy nder and includir g' a central hub 3 which is bored longitudina ly for the tion of the shaft -lby which the di rotated and to which it is reniovably sewn-ed b inenns of a clai'uping nut 5 on the thread-- ed extremity of the shaft. .i notched collar i splined to the shaft -l i'Bi'iWPill the nut 53 and the hub 3 interlocks with the similarly notched end of the hub and prevents relative rotation of the shaft and hub. The urved outer surface of the 'l ruinc 2, which is concentric with the axis of the shaft, extends circumferentially through about one-half of the complete circumference oi a cylinder of corresponding diameter and carries the flexible strip 7, mode of leather. which passes around and is supported by said curved outer surface and its ends secured o the Serial No. 198,520.

frame at points which lie between the cenof felt or similar material preferably i11- terposed between the frame and the strip 7, in order to provide a sutiiciently yielding stri'ippiug surface.

For securing the ends of the strip 7 t0 the frame 2 I employ a rod 9 extending lengthwise of the frame and carried by pivot bolts 10 passing thiouo'h end flanges 11 on the hub 3 and screwed into the opposite ends or the rod, which is provided with two longitudinullyextending' series of substantially radial pins ii. The ends of the strip 7 overlap the rod 5) on opposite sides of the latter and are provided with perforations which receive the eorresponding. series of pins 12, and after the strip has thus been connected to the rod one end of a suitable lever is inserted into a. recess 13 formed in onc'side of said rod and the latter is rotated until the strip is subjected to the desired tension. whereupon the rod is imniovably clamped by tightening the pivot bolts 10. By menusv of the arrangementjust described the strip can be readily attached to and detached from the frame ani firmly held under any desired tension, and sin-re the tension is applied equally and simultaneously to both ends of the strip the latter is subjected to a substantially uniform tension throughout and has no tendency to slip longitudinally.

The particular form of stropping device above described intended for use in a machine in whirl: ivvo suchdiu'iccs are arranged to perate al erualely "on the same blade, which is the reason For limiting the Streppine urtzu-e to =1 little than half acomplete circumi'ereuce. but it will be evident thal' the ame strip-attaching means maybe employed in similar stropping devices which perate through more than half a circumference. if desired. It will also be evident that the invention may be embodied in other eylinder and providing an open space between them. an exposed rod pivotnily mounted in the end flanges. diznnetriezdiy opposite the eenter of the segment. a flexible strip passing around the e \'iindrieui portion of the frame. means carried by the rod for engaging the exposed ends of the strip innd- 5111601151 and means for ehnnping the rod in fixed relation to the t'rznne and drip.

2. A device. of the ehnrneter deserihed. comprising a frame having the form of a segment of n e vlinder and int-hiding :1 central huh ni'hipted to he Hlrl'ihtetl on shaft and end flanges located within the periphery of the eyiindei'. a rod pivotnlly mounted in the end flanges and provided on opposite sides with lines of ontnurdly-extending pins 21 fiexihle strip passing around the cylindiiezd portion of the frame and having its ends perforated to reeeive v nid lines of pins r espeetivetv. and means for ehunning the rod in fixed relation to the frame md strip.

Signed at Boston. Mass. this ti'lth day Of X-tober, 1917.

WILLIAM E. XICKE HSON. 

